Pour les démonstrateurs équatoriens de la chose, peut-être un débute de réponse ici:
Shapiro then covered the tank with a plastic sheet, kept the temperature constant, and sat down to read comic books or whatever scientists do while they wait for their experiments to percolate. When he pulled the plug after an hour or two, the water went down the drain clockwise, presumably because it still retained some clockwise motion from filling.
On the other hand, if Shapiro pulled the plug after waiting a full 24 hours, the draining water spiraled counterclockwise, indicating that the motion from filling had subsided enough for the Coriolis effect to take over. When the plug was pulled after four to five hours, the water started draining clockwise, then gradually slowed down and finally started swirling in the opposite direction.
[^] # Re: Easter Eggs: le demiurge renvoie l'ascenseur (des étoiles) à Debia
Posté par Frank-N-Furter . En réponse au journal Aptitude (Debian) : la grande désillusion. Évalué à 1.
Shapiro then covered the tank with a plastic sheet, kept the temperature constant, and sat down to read comic books or whatever scientists do while they wait for their experiments to percolate. When he pulled the plug after an hour or two, the water went down the drain clockwise, presumably because it still retained some clockwise motion from filling.
On the other hand, if Shapiro pulled the plug after waiting a full 24 hours, the draining water spiraled counterclockwise, indicating that the motion from filling had subsided enough for the Coriolis effect to take over. When the plug was pulled after four to five hours, the water started draining clockwise, then gradually slowed down and finally started swirling in the opposite direction.
http://www.straightdope.com/columns/read/149/do-bathtubs-dra(...)
(Au passage The Straight Dope c'est vachement bien!)
Depending on the time of day, the French go either way.